Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.



October 19, 2004
February 13, 2007
Also Known As:
W32/Bagz.d@MM [McAfee], W32/Bagz-C [Sophos], I-Worm.Bagz.c [Kaspersky], WORM_BAGZ.C [Trend Micro], Win32.Bagz.D [Computer Associa
Systems Affected:

W32.Bagz.D@mm is a mass-mailing worm that uses its own SMTP engine to send itself to email addresses gathered from an infected computer. This worm also prevents access to several Web sites by overwriting the local hosts file. It also disables certain security and anti-virus applications.

The email will have a variable subject line and attachment name. The attachment will have an .exe or .zip file extension.

W32.Bagz.D@mm is packed with UPX.

Removing entries from the Hosts file
If this threat has modified the Windows Hosts file, there are two ways to remove these entries:
  • Install and run the current version of LiveUpdate. This will remove only the entries that refer to Symantec domains.
  • Manually edit the Hosts file and remove all the entries that the worm added.

To run the current version of LiveUpdate
  1. Click download LiveUpdate.

    If you are not reading this Web page on the computer that is getting the error notice, the address for downloading the file is:

    If necessary, you can type this address into the address bar of the problem computer. Changes to the Hosts file will not stop you from getting to this site.

  2. Save the file to the Windows desktop.
  3. Double-click the lusetup.exe icon on the desktop to install LiveUpdate.
  4. Run LiveUpdate.
  5. Did you see the message "LU1860: LiveUpdate has detected a potential security compromise on your computer"?
    • If you did, let LiveUpdate "Remove these entries from the hosts files" (Recommended).
      This should allow LiveUpdate to run.
    • If you did not, that was not the cause of the problem. Return to the Removal section.

To manually edit the Hosts file and remove all the entries that the worm added

Note: The location of the Hosts file may vary and some computers may not have this file. For example, if the file exists in Windows 98, it will usually be in C:\Windows; and it is located in the C:\WINNT\system32\drivers\etc folder in Windows 2000. There may also be multiple copies of this file in different locations.

Follow the instructions for your operating system:
  • Windows 95/98/Me/NT/2000
    1. Click Start, point to Find or Search, and then click Files or Folders.
    2. Make sure that "Look in" is set to (C:) and that "Include subfolders" is checked.
    3. In the "Named" or "Search for..." box, type:


    4. Click Find Now or Search Now.
    5. For each Hosts file that you find, right-click the file, and then click Open With.
    6. Deselect the "Always use this program to open this program" check box.
    7. Scroll through the list of programs and double-click Notepad.
    8. When the file opens, delete all the entries in step number 4 of the "Technical Details" section.
    9. Close Notepad and save your changes when prompted.

  • Windows XP
    1. Click Start > Search.
    2. Click All files and folders.
    3. In the "All or part of the file name" box, type:


    4. Verify that "Look in" is set to "Local Hard Drives" or to (C:).
    5. Click More advanced options.
    6. Check Search system folders.
    7. Check Search subfolders.
    8. Click Search.
    9. Click Find Now or Search Now.
    10. For each Hosts file that you find, right-click the file, and then click Open With.
    11. Deselect the Always use this program to open this program check box.
    12. Scroll through the list of programs and double-click Notepad.
    13. When the file opens, delete all the entries in step number 4 of the "Technical Details" section.
    14. Close Notepad and save your changes when prompted.

Antivirus Protection Dates

  • Initial Rapid Release version October 20, 2004
  • Latest Rapid Release version May 07, 2019 revision 006
  • Initial Daily Certified version October 20, 2004
  • Latest Daily Certified version May 07, 2019 revision 008
  • Initial Weekly Certified release date October 20, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When W32.Bagz.D@mm is executed, it does the following:
  1. Creates the following files:
    • %System%\rpc32.exe
    • %System%\run32.exe
    • %System%\sysboot.doc (many spaces) .exe
    • %System%\about.doc (many spaces) .exe
    • %System%\
    • %System%\admin.doc (many spaces) .exe
    • %System%\
    • %System%\archivator.doc (many spaces) .exe
    • %System%\
    • %System%\archives.doc (many spaces) .exe
    • %System%\
    • %System%\ataches.doc (many spaces) .exe
    • %System%\
    • %System%\backup.doc (many spaces) .exe
    • %System%\
    • %System%\docs.doc (many spaces) .exe
    • %System%\
    • %System%\documentation.doc (many spaces) .exe
    • %System%\
    • %System%\help.doc (many spaces) .exe
    • %System%\
    • %System%\inbox.doc (many spaces) .exe
    • %System%\
    • %System%\manual.doc (many spaces) .exe
    • %System%\
    • %System%\outbox.doc (many spaces) .exe
    • %System%\
    • %System%\payment.doc (many spaces) .exe
    • %System%\
    • %System%\photos.doc (many spaces) .exe
    • %System%\
    • %System%\rar.doc (many spaces) .exe
    • %System%\
    • %System%\readme.doc (many spaces) .exe
    • %System%\
    • %System%\save.doc (many spaces) .exe
    • %System%\
    • %System%\zip.doc (many spaces) .exe
    • %System%\

      Note: %System% is a variable that refers to the System folder. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  2. Creates a service with the following properties:

    Display Name: Network Explorer
    Image Path: %System%\rpc32.exe
    Description: Starts and configures accessibility tools from one window

  3. Deletes a number of processes and registry values in an attempt to disable antivirus and security applications. See the processes section below for a complete list.

  4. Appends the following lines to the infected computer's hosts file, which prevents access to several security related Web sites, and stops many antivirus programs from updating correctly:

  5. Gathers email addresses from files with the following extensions:
    • .TBB
    • .tbb
    • .TBI
    • .tbi
    • .DBX
    • .dbx
    • .HTM
    • .htm
    • .TXT
    • .txt

      Avoids sending email to addresses containing any of the following strings:
    • winzip
    • winrar
    • webmaster@
    • update
    • unix
    • support@
    • support
    • spam
    • sopho
    • samples
    • root@
    • rating@
    • postmaster@
    • pgp
    • panda
    • ntivi
    • noreply
    • noone@
    • nobody@
    • news
    • netadmin@
    • local
    • listserv
    • linux
    • kasp
    • info@
    • icrosoft
    • hostmaster@
    • help@
    • google
    • gold-certs@
    • gold-
    • free-av
    • feste
    • f-secur
    • contract@
    • contact@
    • certs@
    • certific
    • cafee
    • bugs@
    • bsd
    • anyone@
    • all@
    • administrator@
    • admin
    • abuse
    • @microsoft
    • @messagelab
    • @iana
    • @foo
    • @avp
    • oocies

  6. Uses its own SMTP engine to send emails to the collected addresses. The email has the following characteristics:

    Subject: (one of the following)
    • ASAP
    • please responce
    • Read this
    • urgent
    • toxic
    • contract
    • Money
    • office
    • Have a nice day
    • Hello
    • Russian's
    • Amirecans
    • attachments
    • attach
    • waiting
    • best regards
    • Administrator
    • Warning
    • text
    • Vasia
    • re: Andrey
    • re: please
    • re: order
    • Allert!
    • Att

      Message Body: (one of the following)
    • Hi
      Did you get the previous document I attached for you?
      I resent it in this email just in case, because I
      really need you to check it out asap.
      Best Regards
    • Hi
      I made a mistake and forgot to click attach
      on the previous email I sent you. Please give me
      your opinion on this opportunity when you get a chance.
      Best Regards
    • Hi
      I was supposed to send you this document yesterday.
      Sorry for the delay, please forward this to your family if possible.
      It contains important info for both of you.
    • Hi
      Sorry, I forgot to send an important
      document to you in that last email. I had an important phone call.
      Please checkout attached doc file when you have a moment.
      Best Regards
    • Hi
      I was in a rush and I forgot to attach an important
      document. Please see attached doc file.
      Best Regards,
    • Sorry to bother you, but I am having a problem receiving your emails.
      I am responding to your last email in the attached file.
      Please get back to me if there is any problem reading the attachment.
    • I am responding to your last email in the attached file.
      I had a delivery problem with your inbox, so maybe you'll receive this
    • Can you please check out the email I have attached?
      For some reason, I received only part of your last several emails.
      I want to make sure that there are no problems with either of our
    • This email is being sent as attachment because
      it was previously blocked by your email filters.
      Please view the attachment and respond.
    • I resent this email as attachment because
      it was previously blocked by your email filters.
      Please read the attachment and respond.
    • I apologize, but I need you to verify
      that I have the correct contact info for you.
      My system crashed last weekend and
      I lost most of my friends and work contacts.
      Please check the attached (.pdf) and
      please let me know if your info is current.
    • My last email to you was returned.
      The reason is that I am not currently
      added to your "allowed" contact list.
      Please add my updated contact info
      provided in the attached (.pdf) file
      so I can send you emails in the future.
    • I have updated my email address
      See the (.pdf) file attached and
      please respond if you have any questions.
    • We have made recent updates to our database.
      Please verify your mailing address on file is correct.
      We have attached a (.pdf) sheet for you to use for your response.
    • Hello
      Our contact information has changed.
      See the attached (.pdf) sheet for details.
      Due to your failure to comply with our email
      Rules and Regulations, your email account has been
      temporarily suspended for 24 hours unless we are contacted regarding
      this situation.
      You must read the attached document for further
      instructions. Failure to comply will result in termination of your
      Net Operator
      You are currently unable to send emails.
      This may be a billing issue.
      Please call the billing center.
      The # for the billing office is located in the attached
      contact list for your convenience.
      The previous email you sent has been recognized as spam.
      This means your email was not delivered to your friend or client.
      You must open the attached file to receive more information.
    • Hello,
      What version of windows you are using?
      This last document I received from you came out weird.
      Please see the attached word file and resend the file to me.
      Many thanks,
    • Hello,
      My PC crashed while I was sending that last email.
      I have re-attached the document of yours that I discovered.
      Please read attached document and respond ASAP.
    • Hello,
      Your email was sent in an INVALID format.
      To verify this email was sent from you,
      simply open the attached email (.eml) file
      and click yes in the sender options box.
      Thank You,
    • Hello,
      Your email was received.
      Please view the attached text file for instructions.
    • Hello,
      I was in a hurry and I forgot to attach an important
      document. Please see attached.
      Best Regards,
    • Hello,
      I resent this email as attachment because
      it was previously blocked by your email filters.
      Please read the attachment and respond.
    • Hello,
      Sorry, I forgot to attach the new contact information.
      Please view the attached (.pdf) contact sheet.

      Attachment: (one of the following)
    • backup.doc (manyspaces) .exe
    • admin.doc (manyspaces) .exe
    • archivator.doc (manyspaces) .exe
    • about.doc (manyspaces) .exe
    • readme.doc (manyspaces) .exe
    • help.doc (manyspaces) .exe
    • photos.doc (manyspaces) .exe
    • payment.doc (manyspaces) .exe
    • archives.doc (manyspaces) .exe
    • manual.doc (manyspaces) .exe
    • inbox.doc (manyspaces) .exe
    • outbox.doc (manyspaces) .exe
    • save.doc (manyspaces) .exe
    • rar.doc (manyspaces) .exe
    • zip.doc (manyspaces) .exe
    • ataches.doc (manyspaces) .exe
    • documentation.doc (manyspaces) .exe
    • docs.doc (manyspaces) .exe
    • sysboot.doc (manyspaces) .exe


W32.Bagz.D@mm deletes the following processes and registry values as described in Step 3:
  • pfwadmin.exe
  • persfw.exe
  • sched.exe
  • aswupdsv.exe
  • aswregsvr.exe
  • aswboot.exe
  • ashskpck.exe
  • ashskpcc.exe
  • ashsimpl.exe
  • ashserv.exe
  • ashquick.exe
  • ashpopwz.exe
  • ashmaisv.exe
  • ashlogv.exe
  • ashdisp.exe
  • ashchest.exe
  • ashbug.exe
  • ashavast.exe
  • symnavo.dll
  • statushp.dll
  • sdstp32i.dll
  • sdsok32i.dll
  • sdsnd32i.dll
  • sdpck32i.dll
  • scriptui.dll
  • scanmgr.dll
  • scandres.dll
  • scandlvr.dll
  • savscan.exe
  • savrtpel.sys
  • savrt32.dll
  • savrt.sys
  • s32navo.dll
  • s32integ.dll
  • quaropts.dat
  • quarantine
  • quar32.dll
  • qspak32.dll
  • qconsole.exe
  • qconres.dll
  • ptchinst.dll
  • probegse.dll
  • patch25d.dll
  • opscan.exe
  • officeav.dll
  • oeheur.dll
  • netbrext.dll
  • navwnt.exe
  • navw32.exe
  • navuihtm.dll
  • navui.nsi
  • navui.dll
  • navtskwz.dll
  • navtasks.dll
  • navstub.exe
  • navstats.dll
  • navshext.dll
  • navprod.dll
  • navopts.dll
  • navoptrf.dll
  • navntutl.dll
  • navlucbk.dll
  • navlogv.dll
  • navlnch.dll
  • navlcom.dll
  • navevent.dll
  • naverror.dll
  • navcomui.dll
  • navcfgwz.dll
  • navapw32.exe
  • navapw32.dll
  • navapsvc.exe
  • navapscr.dll
  • navap32.dll
  • n32exclu.dll
  • n32call.dll
  • ltchkres.dll
  • djsalert.dll
  • defalert.dll
  • cfgwzres.dll
  • cfgwiz.exe
  • ccimscn.exe
  • cimscan.dll
  • ccavmail.dll
  • bootwarn.exe
  • avres.dll
  • avcompbr.dll
  • apwutil.dll
  • apwcmdnt.dll
  • aboutplg.dll
  • zlparser.dll
  • vsvault.dll
  • sruledb.dll
  • vsmon.exe
  • vsdb.dll
  • vsavpro.dll
  • ssleay32.dll
  • cerbprovider.pvx
  • camupd.dll
  • zonealarm.exe
  • zl_priv.htm
  • zlclient.exe
  • zav.zap
  • zauninst.exe
  • zatutor.exe
  • tutorwiz.dll
  • security.zap
  • programs.zap
  • idlock.zap
  • framewrk.dll
  • firewall.zap
  • filter.zap
  • email.zap
  • alert.zap
  • wormres.dll
  • vsowow.dll
  • vsoupd.dll
  • vsoui.dll
  • mcshield.dll
  • vsagntui.dll
  • shlres.dll
  • shextres.inf
  • shextbin.inf
  • scrstres.inf
  • scrpsbin.inf
  • scrpres.dll
  • scanserv.dll
  • scan.dat
  • patchw32.dll
  • outscres.dll
  • outscan.dll
  • ntclient.dll
  • naievent.dll
  • naiann.dll
  • mcvsworm.dll
  • mcvsskt.dll
  • mcvsshld.exe
  • mcvsshl.dll
  • mcvsscrp.dll
  • mcvsrte.exe
  • mcvsmap.exe
  • mcvsftsn.exe
  • mcvsescn.exe
  • mcvsctl.dll
  • mcurial.dll
  • mcshield.exe
  • mcscan32.dll
  • mcmnhdlr.exe
  • mcavtsub.dll
  • imscnres.inf
  • imscnbin.inf
  • ftscnres.dll
  • emscnres.dll
  • edisk.dll
  • ashldres.dll
  • appinit.ini
  • 804mbd1.img
  • 804mbd1.chk
  • mghtml.exe
  • mcinfo.exe
  • mcappins.exe
  • dunzip32.dll
  • mvtx.exe
  • mpfwizard.exe
  • mpfupdchk.dll
  • mpfui.dll
  • mpftray.exe
  • mpfservice.exe
  • mpfconsole.exe
  • mpfagent.exe


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
  1. Disable System Restore (Windows Me/XP).
  2. Find and stop processes.
  3. Find and stop services.
  4. Reinstall NAV.
  5. Update the virus definitions.
  6. Run a full system scan and delete all the files detected as W32.Bagz.D@mm.

For specific details on each of these steps, read the following instructions.

1. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article, "Antivirus Tools Cannot Clean Infected Files in the _Restore Folder ," Article ID: Q263455.

2. To find and stop a process
  1. Press Ctrl+Alt+Delete once.
  2. Click Task Manager.
  3. Click the Processes tab.
  4. Double-click the Image Name column header to alphabetically sort the processes.
  5. Scroll through the list and look for rpc32.exe.
  6. Click the filename, and then click End Process.
  7. Exit the Task Manager.

3. To find and stop the service
  1. Click Start, and then click Run.
  2. Type services.msc, and then click OK.
  3. Locate and select the service, "Network Explorer".
  4. Click Action, and then click Properties.
  5. Click Stop.
  6. Change Startup Type to Manual.
  7. Click OK and close the Services window.
  8. Restart the computer.

4. To reinstall NAV:
a. Close all programs, and restart the computer.
b. Reinstall NAV from your original installation CD or downloaded installation files.
c. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files.
5. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

    Note: If you see an error, such as LU1418, when you try to run LiveUpdate and you cannot get the Web site hosting the Intelligent Updater, it is likely that W32.Bagz.D@mm has modified the hosts file. You can either download and install LiveUpdate 2.5, which can remove Symantec entries from that file, or you can edit it yourself. See the instructions for both in the "Additional Information" section below.

6. To scan for and delete the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.Bagz.D@mm, click Delete.

    If your Symantec antivirus product reports that it cannot delete an infected file, Windows may be using the file. To fix this, run the scan in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode." Once you have restarted in Safe mode, run the scan again.

    When all the infected files have been deleted, restart the computer in Normal mode.

Writeup By: Takayoshi Nakayama